Facebook is trying to expand its trademark rights over the word “book” by adding the claim to a newly revised version of its “Statement of Rights and Responsibilities,” the agreement all users implicitly consent to by using or accessing Facebook
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You may recall that Facebook has launched multiple lawsuits against websites incorporating the word “book” into their names. Facebook, as far as we can tell, doesn’t have a registered trademark on “book.” But trademark rights can be asserted based on use of a term, even if the trademark isn’t registered, and adding the claim to Facebook’s user agreement could boost the company’s standing in future lawsuits filed against sites that use the word.

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